Why UVB is Non-Negotiable
Without adequate UVB radiation, reptiles cannot synthesise Vitamin D3, which is essential for calcium absorption. The result is Metabolic Bone Disease (MBD) — a devastating, painful, and entirely preventable condition that softens and deforms bones.
T5 vs T8: What’s the Difference?
T5 tubes are slimmer, more powerful, and project UVB over greater distances. They are the current industry standard for all medium-to-large enclosures. T8 tubes are older technology, weaker, and only suitable for very small/shallow vivaria.
Top Pick: Arcadia ProT5 Kit
The UK’s most trusted reptile lighting brand. The ProT5 kits come with a high-quality reflector that focuses the UVB output, dramatically increasing efficiency.
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The Ferguson Zone System
Different species require different UV intensities. The Ferguson Zone system (Zones 1–4) classifies species by their wild basking behaviour:
- Zone 1 (Shade Dweller): Leopard Geckos, Royal Pythons — 6% T5 or ShadeDweller
- Zone 2 (Partial Sun): Corn Snakes, Crested Geckos — 6% T5
- Zone 3 (Open Sun): Bearded Dragons — 12–14% T5
- Zone 4 (Midday Sun): Desert Monitors — 14% T5
Replacement Schedule
UVB tubes lose effectiveness over time, even when the visible light looks fine. Replace every 6–12 months depending on the manufacturer’s recommendation. Mark the installation date on the tube with a marker.
